Asalamualykum
Ameen. I am sorry to hear about your loss. May Allah swt help you and your family to get through this difficult time Ameen. May Allah swt grant her jannah and may the angels provide comfort and company for your grandma Ameen.
Keep praying to Allah swt. There's a really good dua that you can recite. Ask Allah swt to get you through this difficult time and ask Him to replace this situation with something better insha Allah. Keep praying for your grandma and this will bring comfort to your heart. Also donate or start a project with the intention of the good reaching your grandma insha Allah.
Your grandma is now with Allah swt. Nothing is more comforting than this. Alhamdulilah and Allah swt is the Most Merciful.